Five 30A x 208/240V drops terminating with Nema L6-30r receptacles. Get Some PDUs to plug into those. Save
the last 10A of headroom for some huge ass fans. You'll need them.
Why would you want to use 120V? PC power supplies can run on either. 240V is more efficient, cheaper, and puts less stress/heat on the power supplies.
This is exactly what I was looking for, I think. When you say the pc power supply can be run on 240V, are you talking about using the PDUs that others have suggested or something else? I can't plug them directly in as the plug doesnt fit in the Nema L6-30r.
You use something like this to power your PSU's:
http://www.buypdu.com/power-cords/iec-c13/iec-c14.html?gclid=CPLX_vTu-78CFWwQ7AodfRcA9wDepending on the PSUs you are running will determine if you get the 10 or 15 amp version (though in truth, at 208/240v you will only need the 10amp). The Triplite PDUs are set up to use these cords and will work with any EVGA/OCZ power supply. A typical PDU can be found here:
http://www.tripplite.com/metered-pdu-30a-208v-240v-2u-c13-c19-outlets-l6-30p-single-phase~PDUMH30HV/Remember, it's more efficient to use 208/240 versus 120 to power your equipment.